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Related Experiment Videos

Radiation measurements aboard Spacelab 1.

E V Benton1, J Almasi, R Cassou

  • 1Physics Department, University of San Francisco, California 94117, USA.

Science (New York, N.Y.)
|July 13, 1984
PubMed
Summary

Spacelab 1 experienced higher radiation levels than previous missions, with increased low-linear energy transfer (LET) dose rates and significant fluxes of high charge and energy (HZE) particles due to its higher orbit.

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Area of Science:

  • Space science
  • Radiation physics
  • Astronaut safety

Background:

  • Space missions expose astronauts to unique radiation environments.
  • Previous space shuttle flights provided baseline radiation data.
  • Understanding radiation exposure is critical for long-duration spaceflight.

Purpose of the Study:

  • To measure the radiation environment within Spacelab 1.
  • To compare radiation levels with previous space shuttle missions.
  • To assess the impact of orbital inclination on radiation exposure.

Main Methods:

  • Utilized passive radiation detectors placed throughout Spacelab 1, including the module, access tunnel, and external pallet.
  • Measured low-linear energy transfer (LET) radiation using thermoluminescence detectors.

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  • Quantified high charge and energy (HZE) particle fluxes.

    • Main Results:

    • Average low-LET dose rate inside Spacelab 1 was 11.2 millirads/day, approximately double that of previous shuttle flights.
    • Observed substantial fluxes of highly ionizing HZE particles.
    • Overall average mission dose-equivalent reached about 150 millirems, over three times higher than previous missions.

    Conclusions:

    • Spacelab 1's higher orbital inclination (57 degrees) significantly increased radiation exposure.
    • The increased exposure was attributed to both higher low-LET dose rates and greater HZE particle fluxes.
    • Findings highlight the need for enhanced radiation shielding and monitoring for future high-inclination space missions.